CN105450195B - Common mode filter - Google Patents
Common mode filter Download PDFInfo
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- CN105450195B CN105450195B CN201410549643.1A CN201410549643A CN105450195B CN 105450195 B CN105450195 B CN 105450195B CN 201410549643 A CN201410549643 A CN 201410549643A CN 105450195 B CN105450195 B CN 105450195B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 41
- 230000004888 barrier function Effects 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 4
- 230000012447 hatching Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/42—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
- H03H7/425—Balance-balance networks
- H03H7/427—Common-mode filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
- H01P1/20345—Multilayer filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
- H01P3/081—Microstriplines
- H01P3/082—Multilayer dielectric
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0224—Patterned shielding planes, ground planes or power planes
- H05K1/0227—Split or nearly split shielding or ground planes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0245—Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09218—Conductive traces
- H05K2201/09263—Meander
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Filters And Equalizers (AREA)
- Structure Of Printed Boards (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
A common mode filter. The common mode filter includes: a circuit board, a grounding component, a transmission line pair and an extension component; the circuit board comprises a first signal layer, a second signal layer, a third signal layer and a fourth signal layer; the grounding component is arranged on the second signal layer and comprises a grounding part and a first grounding wire which are electrically connected, wherein the grounding part is provided with a groove, and the first grounding wire is arranged in the groove and extends to the opening of the groove from the bottom of the groove; the transmission line pair is arranged on the first signal layer, wherein the orthographic projection of the transmission line pair on the first signal layer is partially overlapped with the orthographic projection of the grounding part on the first signal layer, and the orthographic projection of the transmission line pair on the first signal layer is not overlapped with the orthographic projection of the first grounding line on the first signal layer; the extension assembly is arranged on the third signal layer and is electrically connected with the first grounding wire through at least one conductive hole. The invention has the extension component electrically connected to the grounding component, and can reduce the design complexity and cost.
Description
Technical field
The present invention relates to a kind of wave filter, and more particularly to a kind of common-mode filter.
Background technology
Common-mode filter (common mode filter) can be used for suppressing what differential signal was formed on the transmit path
Electromagnetic interference (electromagnetic interference, abbreviation EMI), therefore it is widely used in various electronic installations
In.In addition, with the miniaturization of electronic installation, made using printed circuit board (PCB) (printed circuit board, abbreviation PCB)
The common-mode filter that the technology of making is formed also gradually obtains the favor in market.
For PCB manufacturing technologies, Parameters variation and laminated construction between PCB materials in itself, sheet material etc. all can shadows
Ring the component characteristic of common-mode filter.Therefore, designer must often expend substantial amounts of design time to consider PCB manufacture factors
To the influence caused by common-mode filter, and then add the design cost of common-mode filter.Therefore, how common mode filtering is reduced
Device complexity in design and design cost, have been the big problems that common-mode filter is faced in design.
Accordingly, it is desirable to provide a kind of common-mode filter solves the above problems.
The content of the invention
The present invention provides a kind of common-mode filter, and at least adjustment circuit that can be connected using extension assembly adjusts frequently
Rate responds, and then helps to reduce common-mode filter complexity in design and design cost.
The common-mode filter of the present invention includes：One circuit board, a grounding assembly, a transmission line pair and an extension assembly；
The circuit board includes one first to 1 the 3rd signals layer；The grounding assembly is arranged on the secondary signal layer, and including being electrical connected
A grounding parts and one first ground wire, the wherein grounding parts there is a groove, and this first is grounded and is arranged in the groove,
And the opening of the groove is extended to from the bottom of the groove；The transmission line is to being arranged on first signals layer, the wherein transmission line
Orthographic projection in first signals layer is partly overlapped with orthographic projection of the grounding parts in first signals layer, and the transmission line pair
First signals layer orthographic projection with this first ground wire first signals layer orthographic projection non-overlapping copies；The extension assembly
The 3rd signals layer is arranged on, and first ground wire is electrically connected with by an at least conductive hole.
In one embodiment of this invention, above-mentioned extension assembly includes the first extension line, and above-mentioned at least one is conductive
Hole includes the first conductive hole.In addition, the first ground wire is electrically connected with the first extension line, and common-mode filter by the first conductive hole
Also include the first adjustment circuit.Wherein, one end of the first adjustment circuit is electrically connected with the first extension line, and the first adjustment circuit is used
To adjust the frequency response of common-mode filter.
There is the extension assembly for being electrically connected to grounding assembly based on above-mentioned, of the invention common-mode filter.Thereby, common mode
Wave filter can be electrically connected with an at least adjustment circuit by extension assembly, and can be adjusted by an at least adjustment circuit
Its frequency response.Thereby, common-mode filter complexity in design and design cost can will be reduced.
For features described above of the invention and advantage can be become apparent, special embodiment below, and it is attached appended by cooperation
Figure is described in detail below.
Brief description of the drawings
Fig. 1 is the structural representation of the common-mode filter according to one embodiment of the invention.
Fig. 2 is the perspective structure signal of the common-mode filter orthographic projection of foundation one embodiment of the invention at grade
Figure.
Fig. 3 is the schematic equivalent circuit of the common-mode filter according to one embodiment of the invention.
Fig. 4 is the Common Mode insertion loss figure of the common-mode filter according to one embodiment of the invention.
Fig. 5 to Fig. 7 is the profile of A-A ' hatching of the common-mode filter of foundation one embodiment of the invention along Fig. 2.
Fig. 8 is the perspective structure schematic diagram of the common-mode filter according to another embodiment of the present invention.
Primary clustering symbol description：
100 common-mode filters
110 circuit boards
111 first signals layers
112 secondary signal layers
113 the 3rd signals layers
120 transmission lines pair
121 first transmission lines
122 second transmission lines
130 grounding assemblies
131 grounding parts
132 first ground wires
140 extension assemblies
141 first extension lines
142 second extension lines
150 grooves
The bottom of 151 grooves
152nd, the side wall of 153 grooves
161 first conductive holes
162 second conductive holes
171st, 172,181,182,720,730 weld pad
L11~L15 reference lines
A-A ' hatchings
310 first adjustment circuits
L31~L33 inductance
C31, C32, C81, C82 electric capacity
R3 resistance
The connection ends of P31 first
P32 second connection ends
410~430 characteristic curves
510th, 610 first insulating barrier
520th, 620 second insulating barrier
630 the 3rd insulating barriers
640 the 4th signals layers
710th, 810 the 3rd conductive hole
820 the 3rd extension lines
830 the 4th extension lines
840 second adjustment circuits
850 ground planes
860 second ground wires
Embodiment
Fig. 1 is the structural representation of the common-mode filter according to one embodiment of the invention, and wherein L11~L15 is to table
Show the reference line of the configuration structure of common-mode filter 100.Reference picture 1, common-mode filter 100 include circuit board 110, transmission line pair
120th, grounding assembly 130 and extension assembly 140.Wherein, circuit board 110 includes the first to the 3rd signals layer 111~113.Transmission
Line is arranged on the first signals layer 111 to 120, and transmission line includes the first transmission line 121 and the second transmission line 122 to 120.This
Outside, the first transmission line 121 and the second transmission line 122 are symmetrical with reference line L11 (that is, transmission line is to 120 center line).This
Outside, the first transmission line 121 and the second transmission line 122 each have a serpentine structure.
Grounding assembly 130 is arranged on secondary signal layer 112, and grounding assembly 130 include the grounding parts 131 that are electrical connected with
First ground wire 132.Wherein, grounding parts 131 have a groove 150.First ground wire 132 is arranged in groove 150, and first
The first end of ground wire 132 is electrically connected to the bottom 151 of groove 150.In addition, first is grounded 132 from the bottom of groove 150
151 extend to the opening of groove 150.Furthermore the first ground wire 132 and the two side 152~153 of groove 150 be separated by respectively to
A few pre-determined distance.That is, first has a gap between ground wire 132 and the side wall 152 of groove 150, and first is grounded
There is another gap between 132 and the side wall 153 of groove 150.
Further to seeing, grounding assembly 130 is symmetrical with reference line L12, and the shape of grounding parts 131 can be for example it is rectangular
Shape.Although Fig. 1 embodiments list the implementation kenel of grounding assembly 130, it is not intended to limiting the invention.For example,
In another embodiment, the shape of grounding assembly 130 also can be for example trapezoidal, square, triangle or be symmetrical with reference line
L12 random geometry, and the first ground wire 132 also can be provided with multiple bendings in response to the shape of grounding assembly 130.
Extension assembly 140 is arranged on the 3rd signals layer 113, and extension assembly 140 prolongs including the first extension line 141 with second
Stretch line 142.In addition, common-mode filter 100 also includes the first conductive hole 161 and the second conductive hole 162.Wherein, such as reference line L14
Shown in L15, the first extension line 141 can be electrically connected to the first ground wire 132, and the second extension by the first conductive hole 161
Line 142 can be electrically connected to the first ground wire 132 by the second conductive hole 162.It is noted that the ordinary skill of this area
Personnel can optionally set weld pad according to design around conductive hole, to strengthen the connection between conductive hole and conduction
Intensity.
For example, in Fig. 1 embodiments, common-mode filter 100 also includes weld pad 171, weld pad 172, weld pad 181 and weldering
Pad 182.Wherein, weld pad 171 is arranged on secondary signal layer 112 with weld pad 172, and weld pad 181 is arranged on the 3rd letter with weld pad 182
Number floor 113.In addition, weld pad 171 and weld pad 181 are looped around around the first conductive hole 161, and it is covered each by the first ground wire
132 and first extension line 141.Thereby, weld pad 171 can strengthen the first conductive hole 161 and the first ground wire respectively with weld pad 181
132nd, the bonding strength of the first extension line 141.Similarly, weld pad 172 and weld pad 182 are looped around around the second conductive hole 162,
And it is covered each by the first ground wire 132 and the second extension line 142.Thereby, weld pad 172 can strengthen second respectively with weld pad 182
Conductive hole 162 and first is grounded the bonding strength of the 132, second extension line 142.
Fig. 2 is the perspective structure signal of the common-mode filter orthographic projection of foundation one embodiment of the invention at grade
Figure.As shown in Fig. 2 transmission line can be for example orthographic projection in the first signals layer to 120, grounding assembly 130 and extension assembly 140
111.In addition, with from the point of view of on the basis of the reference line L11 of the first signals layer 111 (that is, transmission line is to 120 center line),
Transmission line is all right in the orthographic projection of the first signals layer 111 in the orthographic projection of the first signals layer 111 and grounding assembly 130 to 120
Claim in reference line L11.Furthermore transmission line to 110 the first signals layer 111 orthographic projection and grounding parts 131 in the first signals layer
111 orthographic projection partly overlaps, and transmission line is grounded 132 first to 110 in the orthographic projection of the first signals layer 111 and first
The orthographic projection non-overlapping copies of signals layer 111.
Fig. 3 is the schematic equivalent circuit of the common-mode filter according to one embodiment of the invention.As shown in figure 3, transmission line
Can be equivalent into inductance L31 and inductance L32 to 120, and grounding assembly 130 can be equivalent into inductance L33 and resistance R3.Further, since
Transmission line is partly overlapped to 110 and grounding parts 131, therefore electric capacity C31 and electric capacity C32 can be formed on equivalent.In addition, in inductance
Under L31~L33, electric capacity C31~C32 and resistance R3 combination, common-mode filter 100 will can produce corresponding filter response,
And the operating frequency of common-mode filter 100 is relevant to inductance L33 and resistance R3.Thereby, operationally, common-mode filter 100 will
Differential signal can be transmitted to 120 by transmission line, and can be used to filter out the common mode current in differential signal, and then suppress electromagnetism
The generation of interference.
Significantly, since extension assembly 140 is electrically connected with by the first conductive hole 161 and the second conductive hole 162
To the first ground wire 132, therefore common-mode filter 100 can be in the inductance L33 being serially connected and resistance R3 both sides on equivalent
Each extend over out the first connection end P31 and second connection end P32.Consequently, it is possible to common-mode filter 100 can pass through extension assembly
140 components being electrically connected with (for example, first adjustment circuit 310), to adjust the operating frequency of common-mode filter 100.
For example, Fig. 4 is Common Mode insertion loss (Scc21) figure of the common-mode filter according to one embodiment of the invention.
As shown in figure 4, common-mode filter 100 can in response to the first different adjustment circuits 310 and with different characteristic curves 410~
430.Wherein, the recess of each characteristic curve 410~430 is the operating frequency of common-mode filter 100.In other words, pass through
The setting of extension assembly 140, the component that designer can be electrically connected with by extension assembly 140 is (for example, the first adjustment circuit
310) operating frequency of common-mode filter 100 is adjusted, so as to reducing the complexity and design of common-mode filter 100 in design
Cost.
Particularly, the configuration mode of the extension assembly 140 in common-mode filter 100 is extended from grounding assembly 130,
And this configuration mode is different from the traditional concept of common-mode filter in design.In general, traditional common-mode filter exists
All it can avoid extending cabling from grounding assembly 130 as far as possible in design, to avoid triggering unnecessary coupling effect.However,
In Fig. 1, extension assembly 140 is extended from the ad-hoc location (for example, first ground wire 132) of grounding assembly 130, and thereby
The component connected by extension assembly 140 adjusts the operating frequency of common-mode filter 100.
It is worth noting that, the first adjustment circuit 310 also can be for example be arranged on circuit board 110 a signals layer (for example,
3rd signals layer 113) in.In addition, the circuit board 110 in common-mode filter 100 can utilize more than 4 layers of multilayer board
To be realized, and 3 signals layers 111~113 can be subject to reality using any 3 signals layers in multilayer printed circuit
It is existing.For example, Fig. 5 to Fig. 7 is the section of A-A ' hatching of the common-mode filter of foundation one embodiment of the invention along Fig. 2
Figure.
In Fig. 5 embodiments, the circuit board 110 in common-mode filter 100 also includes the first insulating barrier 510 and the second insulation
Layer 520.Wherein, the first insulating barrier 510 is between the first signals layer 111 and secondary signal layer 112, and the second insulating barrier 520
Between the signals layer 113 of secondary signal layer 112 and the 3rd.In addition, the first conductive hole 161 runs through secondary signal layer 112, second
The signals layer 113 of insulating barrier 520 and the 3rd, to be thereby electrically connected to the first ground wire 132 and the first extension line 141.
Furthermore the first insulating barrier 510 can be for example an insulated substrate.Wherein, insulated substrate includes relative first surface
With second surface.In addition, the first surface of insulated substrate is relative to the first signals layer 111, and the second surface phase of insulated substrate
For secondary signal layer 112.In other words, transmission line is provided in the first surface of insulated substrate, and grounding assembly 130 to 120
It is provided in the second surface of insulated substrate.In addition, the 3rd signals layer 113 can be for example the bottom of circuit board 110, and first leads
Electric hole 161 can be for example a blind hole (blind via).In another embodiment, the first conductive hole 161 also can be for example through whole
The through hole (through hole via) of individual circuit board 110.
In Fig. 6 embodiments, the circuit board 110 in common-mode filter 100 also includes the first insulating barrier 610, second and insulated
The 620, the 3rd insulating barrier 630 of layer and the 4th signals layer 640.Wherein, the first insulating barrier 610 is located at the first signals layer 111 and second
Between signals layer 112, the second insulating barrier 620 is located between the signals layer 113 of secondary signal layer 112 and the 3rd, and the 3rd insulating barrier
630 lower section is provided with the 4th signals layer 640.In addition, the first conductive hole 161 is through secondary signal layer 112, the second insulating barrier 620
With the 3rd signals layer 113, to be thereby electrically connected with the first ground wire 132 and the first extension line 141.Furthermore the second insulating barrier 620
Can be an insulated substrate respectively with the 3rd insulating barrier 630, and the first conductive hole 161 can be for example a buried via hole (buried via).
The various embodiments described above are that extension assembly 140 is arranged on into the single signal layer of circuit board 110 (for example, the 3rd signal
Layer is 113) interior.However, in another embodiment, extension assembly 140 also can be for example the multiple signals layers for being arranged on circuit board 110
It is interior.For example, in Fig. 7 embodiments, the first extension line 141 of the 3rd signals layer 113 is arranged on also by the 3rd conductive hole
710 extend to the 4th signals layer 640.Wherein, weld pad 720 and weld pad 730 are looped around around the 3rd conductive hole 710, and respectively
Configuration is in the 3rd signals layer 113 and the 4th signals layer 640, thereby to strengthen the company of the 3rd conductive hole 710 and the first extension line 141
Connect intensity.
It is noted that Fig. 1 common-mode filter 100 can be electrical by the two extension lines difference in extension assembly 140
It is connected to the both ends of the first adjustment circuit 310.However, in another embodiment, Fig. 1 common-mode filter 100 also can be by prolonging
One end that the single extension line in component 140 is electrically connected with the first adjustment circuit 310 is stretched, and the first adjustment circuit 310 is another
End then can be electrically connected to earth terminal by external module.In other words, one of ordinary skill in the art can be according to design
Wherein one (for example, first extension line 141) of two extension lines in extension assembly 140 is optionally removed, and is accordingly moved
Except corresponding conductive hole (for example, first conductive hole 161).
In another embodiment, Fig. 1 common-mode filter 100 may also set up the extension line of more than 3, to pass through extension group
Part 140 is electrically connected with the adjustment circuit of more than 2.For example, Fig. 8 is the common-mode filter according to another embodiment of the present invention
Perspective structure schematic diagram.In Fig. 8 embodiments, common-mode filter 100 also includes the 3rd conductive hole 810, and extension assembly 140
Also include the 3rd extension line 820 and the 4th extension line 830.Wherein, the first ground wire 132 can pass through the first conductive hole 161 and the
Three conductive holes 810 are electrically connected to the 3rd extension line 820 and the 4th extension line 830.Thereby, common-mode filter 100 will be available
3rd extension line 820 and the 4th extension line 830 are electrically connected to the both ends of the second adjustment circuit 840, and then can also pass through second
Adjustment circuit 840 adjusts operating frequency.
Although Fig. 8 embodiments list conductive hole 161,162 and put in order with 810, it is not limited to this hair
It is bright.For example, the 3rd conductive hole 810 in Fig. 8 is between the first conductive hole 161 and the second conductive hole 162.However,
In another embodiment, the first conductive hole 161, which also can be for example, is arranged between the second conductive hole 162 and the 3rd conductive hole 810.
In addition, the first ground wire 132 in Fig. 8 is to be electrically connected to first by same conductive hole (that is, first conductive hole 161) to prolong
Stretch the extension line 820 of line 141 and the 3rd.However, in another embodiment, the first ground wire 132 can also be divided by two conductive holes
The first extension line 141 and the 3rd extension line 820 are not electrically connected to.
In other words, one of ordinary skill in the art can set various combination and the conduction to put in order according to design
Hole, to cause common-mode filter 100 to be electrically connected with an at least adjustment circuit by extension assembly 140.In addition, this area is general
Logical technical staff also using with various combination and the conductive hole to put in order, rings to adjust the frequency of common-mode filter 100
Answer, common mode turns the scattering parameter that the scattering parameter Scc of common mode, the scattering parameter Scd of common mode slip mould and differential mode turn common mode
Sdc。
Fig. 8 is continued referring to, common-mode filter 100 also includes ground plane 850, and grounding assembly 130 also connects including second
Ground wire 860.Wherein, the first end of the second ground wire 860 is electrically connected with the first ground wire 132, and the second of the second ground wire 860
End is electrically connected to ground plane 850.In addition, the first adjustment circuit 310 and the second adjustment circuit 840 can respectively by electric capacity C81 with
Electric capacity C82 is formed.Wherein, electric capacity C81 first end is electrically connected with the first extension line 141, and electric capacity C81 the second end is electrical
Connect the second extension line 142.In addition, electric capacity C82 first end is electrically connected with the 3rd extension line 820, and electric capacity C82 the second end
It is electrically connected with the 4th extension line 830.Furthermore in another embodiment, the first adjustment circuit 310 and the second adjustment circuit 840
It can be made up of respectively any combination of electric capacity, inductance, resistance or said modules.
In summary, common-mode filter of the invention has the extension assembly for being electrically connected to grounding assembly.Thereby, common mode
Wave filter can be electrically connected with an at least adjustment circuit by extension assembly, and can be adjusted by an at least adjustment circuit
Its frequency response.In other words, the adjustment circuit that can be electrically connected with by the setting of extension assembly, designer by extension assembly
To adjust the frequency response of common-mode filter, so as to reduce common-mode filter complexity in design and design cost.
Although the present invention is disclosed as above with embodiment, but it is not limited to the present invention, any affiliated technology neck
Those of ordinary skill in domain, without departing from the spirit and scope of the present invention, it should can make a little change and profit
Decorations, therefore protection scope of the present invention should be defined depending on the scope institute defender of appended claims.
Claims (12)
1. a kind of common-mode filter, the common-mode filter includes：
One circuit board, the circuit board include one first signals layer, a secondary signal layer and one the 3rd signals layer；
One grounding assembly, the grounding assembly are arranged on the secondary signal layer, and the grounding parts including being electrical connected and one first
Ground wire, the wherein grounding parts have a groove, and first ground wire is arranged in the groove, and prolong from the bottom of the groove
Extend the opening of the groove；
One transmission line pair, the transmission line to being arranged on first signals layer, wherein the transmission line in first signals layer just
Projection partly overlaps with orthographic projection of the grounding parts in first signals layer, and the transmission line is to the positive throwing in first signals layer
Shadow with this first ground wire first signals layer orthographic projection non-overlapping copies；And
One extension assembly, the extension assembly are arranged on the 3rd signals layer, and by an at least conductive hole be electrically connected with this first
Ground wire, wherein the extension assembly includes one first extension line, and an at least conductive hole includes one first conductive hole, and this first connects
Ground wire is electrically connected with first extension line by first conductive hole；And
One first adjustment circuit, one end of wherein first adjustment circuit are electrically connected with first extension line, and first adjustment
Circuit is adjusting the frequency response of the common-mode filter.
2. common-mode filter as claimed in claim 1, the wherein transmission line including one first transmission line and one second to transmitting
Line, and first transmission line is symmetrical with a center line of the transmission line pair with second transmission line and each has one to wriggle and ties
Structure.
3. common-mode filter as claimed in claim 2, the wherein grounding assembly are symmetrical with the orthographic projection of first signals layer
The center line.
4. common-mode filter as claimed in claim 3, the wherein circuit board also include being interspersed in first to the 3rd signal
One first insulating barrier and one second insulating barrier between layer, and an at least conductive hole runs through the secondary signal layer, this is second exhausted
Edge layer and the 3rd signals layer, and it is electrically connected with the grounding assembly and the extension assembly.
5. common-mode filter as claimed in claim 4, wherein first insulating barrier are an insulated substrate, and the insulated substrate bag
Relative a first surface and a second surface are included, wherein the transmission line is to being arranged on the first surface, and the grounding assembly is set
Put in the second surface.
6. common-mode filter as claimed in claim 3, the wherein grounding assembly also include one second ground wire, the common mode filtering
Device also includes a ground plane, and the first end of wherein second ground wire is electrically connected with first ground wire, and second ground wire
The second end be electrically connected to the ground plane.
7. common-mode filter as claimed in claim 1, the wherein circuit board also include being interspersed in first to the 3rd signal
One first insulating barrier and one second insulating barrier between layer, and an at least conductive hole runs through the secondary signal layer, this is second exhausted
Edge layer and the 3rd signals layer, and it is electrically connected with the grounding assembly and the extension assembly.
8. common-mode filter as claimed in claim 7, wherein first insulating barrier are an insulated substrate, and the insulated substrate bag
Relative a first surface and a second surface are included, wherein the transmission line is to being arranged on the first surface, and the grounding assembly is set
Put in the second surface.
9. common-mode filter as claimed in claim 1, the wherein grounding assembly also include one second ground wire, the common mode filtering
Device also includes a ground plane, and the first end of wherein second ground wire is electrically connected with first ground wire, and second ground wire
The second end be electrically connected to the ground plane.
10. common-mode filter as claimed in claim 1, the wherein extension assembly also include one second extension line, this at least one
Conductive hole also includes one second conductive hole, and first ground wire is electrically connected with second extension line by second conductive hole, and
The other end of first adjustment circuit is electrically connected with second extension line.
11. common-mode filter as claimed in claim 10, wherein first adjustment circuit include an electric capacity, and the of the electric capacity
One end is electrically connected with first extension line, and the second end of the electric capacity is electrically connected with second extension line.
12. common-mode filter as claimed in claim 10, the wherein extension assembly also include one the 3rd extension line and one the 4th
Extension line, an at least conductive hole also include one the 3rd conductive hole, and first ground wire passes through first conductive hole and the 3rd
Conductive hole is electrically connected to the 3rd extension line and the 4th extension line, and the common-mode filter also includes：
One second adjustment circuit, the both ends of wherein second adjustment circuit are electrically connected the 3rd extension line and prolonged with the 4th
Stretch line, and second adjustment circuit is adjusting the frequency response of the common-mode filter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103133960A TWI562536B (en) | 2014-09-30 | 2014-09-30 | Common mode filter |
| TW103133960 | 2014-09-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105450195A CN105450195A (en) | 2016-03-30 |
| CN105450195B true CN105450195B (en) | 2018-01-09 |
Family
ID=55560060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410549643.1A Active CN105450195B (en) | 2014-09-30 | 2014-10-16 | Common mode filter |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US9431991B2 (en) |
| CN (1) | CN105450195B (en) |
| TW (1) | TWI562536B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6180648B2 (en) * | 2015-01-06 | 2017-08-16 | 三菱電機株式会社 | Multilayer circuit board |
| TWI731806B (en) * | 2020-10-16 | 2021-06-21 | 安波科技股份有限公司 | Common mode noise filter |
| CN113727513B (en) * | 2021-07-27 | 2024-01-09 | 平头哥(上海)半导体技术有限公司 | Package substrate, printed circuit board, package device, and electronic apparatus |
| CN115149234B (en) * | 2022-09-02 | 2022-12-30 | 浙江铖昌科技股份有限公司 | Transmission line structure and transmission line design method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102238803A (en) * | 2010-05-06 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board and common-mode filter thereof |
| CN102422533A (en) * | 2009-07-27 | 2012-04-18 | Elmec株式会社 | Common mode filter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011004453A1 (en) | 2009-07-07 | 2011-01-13 | エルメック株式会社 | Common mode filter |
| US8633866B2 (en) * | 2010-02-26 | 2014-01-21 | The Regents Of The University Of Michigan | Frequency-selective surface (FSS) structures |
| US8907748B2 (en) * | 2011-02-01 | 2014-12-09 | Cisco Technology, Inc. | Common-mode suppression filter for microstrip 10-Gb/s differential lines |
| US8907749B2 (en) * | 2012-03-20 | 2014-12-09 | Cisco Technology, Inc. | Gigahertz common-mode filter for multi-layer planar structure |
| TWI499124B (en) * | 2012-08-31 | 2015-09-01 | Univ Nat Taiwan | A filter device having a groove type grounding structure and an equivalent assembly circuit thereof |
-
2014
- 2014-09-30 TW TW103133960A patent/TWI562536B/en active
- 2014-10-16 CN CN201410549643.1A patent/CN105450195B/en active Active
- 2014-12-15 US US14/569,788 patent/US9431991B2/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102422533A (en) * | 2009-07-27 | 2012-04-18 | Elmec株式会社 | Common mode filter |
| CN102238803A (en) * | 2010-05-06 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board and common-mode filter thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201613263A (en) | 2016-04-01 |
| CN105450195A (en) | 2016-03-30 |
| US9431991B2 (en) | 2016-08-30 |
| TWI562536B (en) | 2016-12-11 |
| US20160093937A1 (en) | 2016-03-31 |
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